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United States Patent | 5,105,398 |
Hayakawa ,   et al. | April 14, 1992 |
A three-handed clock has a single movement to rotationally drive the second, minute and hour hands. The rotary output of the movement is transmitted directly to the second hand and is transmitted through a transmission belt to the minute and hour hands. The use of the transmission belt eliminates the need for a gear train to drive the minute and hour hands thereby providing greater design flexibility and ease of assembly and maintenance.
Inventors: | Hayakawa; Tsuyoshi (Tokyo, JP); Yamauchi; Satoru (Tokyo, JP); Aizawa; Junichi (Tokyo, JP); Funahara; Yukio (Tokyo, JP) |
Assignee: | Seikosha Co., Ltd. (JP) |
Appl. No.: | 689719 |
Filed: | April 22, 1991 |
Sep 25, 1987[JP] | 62-241397 | |
Aug 27, 1988[JP] | 63-112254 |
Current U.S. Class: | 368/238; 368/77; 368/80; 368/220; 368/223; 368/276 |
Intern'l Class: | G04B 019/04; G04C 019/02 |
Field of Search: | 368/223,228,238,221,222,276,25,40,77,50 |
1676030 | Jul., 1928 | Helin. | |
3956879 | May., 1976 | Bailey. | |
4034549 | Jul., 1977 | Danley et al. | 368/240. |
4103484 | Aug., 1978 | Bailey. | |
4128949 | Dec., 1978 | Marason, Jr. et al. | 368/45. |
4280211 | Jul., 1981 | Mayenschein. |